diff --git a/src/wp-includes/canonical.php b/src/wp-includes/canonical.php
index 6b8c17c07d55a..683f151d153bd 100644
--- a/src/wp-includes/canonical.php
+++ b/src/wp-includes/canonical.php
@@ -615,6 +615,7 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 		unset( $redirect['port'] );
 	}
 
+	$redirect['path'] = isset( $redirect['path'] ) ? $redirect['path'] : '';
 	// Notice prevention after new parse_url( $redirect_url ) calls
 	$redirect += array(
 		'host'   => '',
@@ -736,6 +737,7 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 		$redirect['host'] = $original['host'];
 	}
 
+	$original['path'] = isset( $original['path'] ) ? $original['path'] : '';
 	$compare_original = array( $original['host'], $original['path'] );
 
 	if ( ! empty( $original['port'] ) ) {